Bruna's Suggestions:
Marina, you have chosen good words to write your biodata and you could articulate the periods well so I didn't have problems during the reading of your text. I just ask you to revise the words "forth" (first line) and the use of "ones" (third line).
Best.


Final Version:

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My name is Marina and I am a student of letras course at UFMG . I am at the fourth semester and at this point I intend to be a English teacher, but this may change . I prefer literature classes to linguistics, but I am not sure if I will be able to focus in this subject. I have only worked twice as an English teacher for members of my family and as a test applicator at UFMG entrance test of 2012.I have not taken any English course.
My major interest in teaching is to develop the use of arts such as music, movies, drawning, painting in my teaching, so I hope to be able to research about it.